make_version.hpp.py: make again python2 compatible
make_version.hpp.py: make again python2 compatible

FileNotFoundError does not exist in Python2.7, replace it by IOError

toxa81/sirius,electronic-structure/sirius,electronic-structure/sirius,electronic-structure/sirius,toxa81/sirius,toxa81/sirius,electronic-structure/sirius,toxa81/sirius,toxa81/sirius,electronic-structure/sirius,electronic-structure/sirius,electronic-structure/sirius,toxa81/sirius